An engineer in Singapore is testing a new braking system. A vehicle travelling at 25 m/s comes to rest in 5.0 s when the brakes are applied. What is the deceleration of the vehicle?

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Question

An engineer in Singapore is testing a new braking system. A vehicle travelling at 25 m/s comes to rest in 5.0 s when the brakes are applied. What is the deceleration of the vehicle?

Accepted Answer

5.0 m/s² — 0 m/s². Award 1 mark for correct calculation: deceleration = change in velocity/time = 25/5.0 = 5.0 m/s². A is incorrect — this results from calculating 1/5. C is incorrect — this results from multiplying 25 by a factor incorrectly. D is incorrect — this results from multiplying speed by time.

Answer

20 m/s²

Answer

125 m/s²

Answer

5.0 m/s²

Answer

0.20 m/s²

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